Curriculum - American History 1901-1950
- All-Pueblo Council
- Allied Intervention in Russia
- Allied Invasion of France
- Allied Invasion of Italy
- Althea Gibson
- Ambrose Bierce
- Amelia Earhart
- The American Automobile Association Forms
- The American Civil Liberties Union is Founded
- American Indian Defense Association
- The American Management Association Is Established
- American Science Fiction Enjoys Its Golden Age
- The Amos ’n’ Andy Radio Show Goes on the Air
- Amy Lowell
- Andrew Carnegie
- Andrew Mellon
- Andrew Wyeth
- Andrews Discovers the First Fossilized Dinosaur Eggs
- Andy Warhol
- Anita Loos
- Anna Howard Shaw
- Anne Sexton
- Annie Oakley
- Anthracite Coal Strike
- Anti-Defamation League Is Founded
- Antitrust Prosecution Forces RCA to Restructure
- Antitrust Rulings Force Film Studios to Divest Theaters
- Armory Show
- The Armstrong Committee Examines the Insurance Industry
- Armstrong First Records with His Hot Five Group
- Armstrong Perfects FM Radio
- Arnold Gesell
- Arnold Schoenberg
- The Arroyo Seco Freeway Opens in Los Angeles
- The Art of Radio Develops from Early Broadcast Experience
- Arthur Caswell Parker
- Arthur Holly Compton
- Arthur Miller
- Artificial Fluoridation of Municipal Water Supplies to Prevent Dental Decay Is Introduced
- The Artificial Sweetener Cyclamate Is Introduced
- Arts and Architecture Magazine Initiates the Case Study Program
- ASCAP Forms to Protect Writers and Publishers of Music
- ASCAP Is Founded to Protect Musicians’ Rights
- Assault at Anzio
- Assault on Iwo Jima
- Assault on Saipan
- Assault on Tinian
- The Atlantic Charter Declares a Postwar Right of Self-Determination
- Atlantic Charter Is Signed
- Atomic Bombing of Japan
